Why is there fighting in Yemen?

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Northern Shia Muslim rebels known as Houthis, backed by forces loyal to Yemen's former President Ali Abdullah Saleh, took over parts of Yemen, including the capital, Sanaa, and forced the government into exile in March 2015

The rebels accused President Abdrabbuh Mansour Hadi's government of corruption and of planning to marginalise their heartland within a proposed federal system

Forces loyal to the government and southern militias regained control of Aden in July, aided by Saudi-led coalition air strikes and troops

The UN says that fighting on the ground and air strikes in Yemen have killed more than 6,200 people, half of them civilians